Optical waveguides – With optical coupler – Switch
Patent
1997-06-09
1998-05-12
Bovernick, Rodney B.
Optical waveguides
With optical coupler
Switch
385 17, 385 20, 385 24, 359117, 359128, G02B 626, H01J 1400
Patent
active
057518688
ABSTRACT:
A horizontally asymmetrically dilated optical switch comprising multiple stages of 2.times.2 optical switching units, especially electro-optic switching units such as acousto-optical tunable filters (AOTFs), which are electrically switchable between a bar state and a cross state to route and switch an optical signal through the switch. The switch is dilated that is, the switching units have an unused input or output so as to dump crosstalk terms into unused outputs. According to the invention, the interconnections between the switching units and their control are such that any optical signal and any crosstalk path passes through equal numbers of bar-state switches and of cross-state switches. Thereby, two advantages are gained. First, no switching path is transparent to a wide bandwidth so that noise cannot recirculate in an amplifying path and go into oscillation. Also, if one state or the other produces greater crosstalk, along no switching path is the larger term accumulated more than the smaller term.
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Bala Krishna
Brackett Charles Arthur
Song Ghie Hugh
Bell Communications Research Inc.
Bovernick Rodney B.
Giordano Joseph
Hey David
Sanghavi Hemang
LandOfFree
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